This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A153447 #15 Sep 03 2023 10:24:56 %S A153447 1,2,4,9,19,49,131,424,1652 %N A153447 Duplicate of A076893. %C A153447 Duplicate of A076893. - _R. J. Mathar_, Jan 03 2009 %D A153447 A. Evnin. An elementary Introduction to Matroids, Mathematical Education, 2(33), 2005, 2-33. %H A153447 A. Evnin, <a href="http://www.mathnet.ru/eng/mo412">An elementary Introduction to Matroids</a>, Mathematical Education 2 (33) (2005), 2-33 %Y A153447 Cf. A034343. %K A153447 dead %O A153447 1,2 %A A153447 _Alexander Evnin_, Dec 26 2008